Laurent Carl Siebenmann (the first name is sometimes spelled Laurence or Larry) (born 1939) is a

Canadian Canadians (french: Canadiens) are people identified with the country of Canada. This connection may be residential, legal, historical or cultural. For most Canadians, many (or all) of these connections exist and are collectively the source of ...

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change. History On ...

based at the Université de Paris-Sud at Orsay,

France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...

. After working for several years as a Professor at Orsay he became a Directeur de Recherches at the Centre national de la recherche scientifique in 1976. He is a topologist who works on manifolds and who co-discovered the

Kirby–Siebenmann class In mathematics, more specifically in topology, geometric topology, the Kirby–Siebenmann class is an obstruction for topological manifolds to allow a ''PL''-structure. The KS-class For a topological manifold ''M'', the Kirby–Siebenmann class \ka ...

Education

Siebenmann's undergraduate studies were at the

University of Toronto The University of Toronto (UToronto or U of T) is a public research university in Toronto, Ontario, Canada, located on the grounds that surround Queen's Park. It was founded by royal charter in 1827 as King's College, the first institution ...

. He received a

Ph.D. A Doctor of Philosophy (PhD, Ph.D., or DPhil; Latin: or ') is the most common degree at the highest academic level awarded following a course of study. PhDs are awarded for programs across the whole breadth of academic fields. Because it is a ...

from

Princeton University Princeton University is a private university, private research university in Princeton, New Jersey. Founded in 1746 in Elizabeth, New Jersey, Elizabeth as the College of New Jersey, Princeton is the List of Colonial Colleges, fourth-oldest ins ...

under the supervision of John Milnor in 1965 with the dissertation ''The obstruction to finding a boundary for an open manifold of dimension greater than five''. His doctoral students at Orsay included Francis Bonahon and

Albert Fathi Albert Fathi (born 27 October 1951, in Egypt) is an Egyptian- French mathematician. He specializes in dynamical systems and is currently a professor at the Georgia Institute of Technology. Fathi attended the ''Collège des frères Lasalle'' in Ca ...

Recognition

In 1985 he was awarded the Jeffery–Williams Prize by the

Canadian Mathematical Society The Canadian Mathematical Society (CMS) (french: Société mathématique du Canada) is an association of professional mathematicians dedicated to the interests of mathematical research, outreach, scholarship and education in Canada. It serves the ...

. In 2012 he became a fellow of the

American Mathematical Society The American Mathematical Society (AMS) is an association of professional mathematicians dedicated to the interests of mathematical research and scholarship, and serves the national and international community through its publications, meetings, ...

.List of Fellows of the American Mathematical Society
retrieved 2013-07-20.

Selected publications

References

External links

a talk by Siebenmann * ttp://owpdb.mfo.de/person_detail?id=3837 Photos at Oberwolfachbr>Home page
* {{DEFAULTSORT:Siebenmann, Laurent C. 1939 births Living people Topologists Princeton University alumni University of Toronto alumni Academic staff of Paris-Sud University Fellows of the American Mathematical Society Canadian mathematicians Scientists from Toronto 20th-century French mathematicians